What is the best way to organize testing of the CopyMik copy, compression and encryption program?

Question

Backup

Good day, It is
necessary to test the program for copying, compressing and encrypting CopyMik files .
The program is free, so there is no budget for testers. At the same time, similar projects are being tested online. Please tell me the best way to go about doing this.
Thanks to everyone who will respond.
ps According to the ideology of copying, the program is close to robocopy but more advanced. Implemented 12 different encryption algorithms The program is absolutely free , there is a Russian language.

Answer 1

Good day to all,
at the moment version 2.18b5 has been
released, at the very least, it was possible to get out of alpha and there have been no errors in beta for the 2nd month.
Testing was partly organized through automated tests (essentially a separate program that generated files and folders, then copied, compressed, encrypted in both directions and then checked the results with the expected ones and checked the checksums of the files before and after the tests) The
first users also helped, not so much in the search for errors (although of course there were some) as much as wishes that made the program more convenient and functional. At the moment, active further development is suspended and focused entirely on testing. I hope to release it in a couple of months.
Thanks to everyone who responded and helped.